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Exsolution of SrO during the topochemical conversion of LaSr3CoRuO8 to the oxyhydride LaSr3CoRuO4H4

DOI: 10.1021/acs.inorgchem.9b02552 DOI Help

Authors: Lun Jin (University of Oxford) , Maria Batuk (EMAT, University of Antwerp) , Franziska K. K. Kirschner (University of Oxford) , Franz Lang (University of Oxford) , Stephen J. Blundell (University of Oxford) , Joke Hadermann (EMAT, University of Antwerp) , Michael A. Hayward (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Inorganic Chemistry

State: Published (Approved)
Published: October 2019
Diamond Proposal Number(s): 13284

Abstract: Reaction of the n = 1 Ruddlesden–Popper oxide LaSr3CoRuO8 with CaH2 yields the oxyhydride phase LaSr3CoRuO4H4 via a topochemical anion exchange. Close inspection of the X-ray and neutron powder diffraction data in combination with HAADF-STEM images reveals that the nanoparticles of SrO are exsolved from the system during the reaction, with the change in cation stoichiometry accommodated by the inclusion of n > 1 (Co/Ru)nOn+1H2n “perovskite” layers into the Ruddlesden–Popper stacking sequence. This novel pseudotopochemical process offers a new route for the formation of n > 1 Ruddlesden–Popper structured materials. Magnetization data are consistent with a LaSr3Co+Ru2+O4H4 (Co+, d8, S = 1; Ru2+, d6, S = 0) oxidation/spin state combination. Neutron diffraction and μ+SR data show no evidence for long-range magnetic order down to 2 K, suggesting the diamagnetic Ru2+ centers impede the Co–Co magnetic-exchange interactions.

Subject Areas: Chemistry

Instruments: I11-High Resolution Powder Diffraction